Each tooth has its maximum whiteness beyond which it will not whiten, regardless of the technique or material used. Peroxide goes through the enamel (the outermost layer) and dentin (middle layer) to the pulp (innermost layer) in 5 to 15 minutes. It changes the genetic color of the dentin and the enamel, and removes stains.
Most teeth get more opaque upon bleaching, but a tooth that's already translucent can become more translucent and may not appear to whiten at all. In these cases, a tooth-colored composite (filling material) placed on the tongue side of the tooth can improve its appearance.
Generally, you can bleach your teeth at age 10 or older, as most of the front adult (permanent) teeth are in by that time. Baby teeth are usually milk-white already the only reason to bleach them would be if they suffered a color-changing trauma but were not diseased.
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